// ==UserScript==
// @name           MyScript
// @namespace      http://example.com
// @description    Example
// @include        *
//
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js
// ==/UserScript==

var shouldHide = false;

$('strong').each(function() {
  if(shouldHide) {
    $(this).hide();
  } else {
    $(this).text("New Text");
  }
});

When I wanted to change some text in a web page, I based my Greasemonkey solution on DumbQuotes. I liked that I could easily define replacement pairs into a list:

当我想更改网页中的某些文本时,我将我的Greasemonkey解决方案基于DumbQuotes。我喜欢我可以轻松地将替换对定义到列表中:

replacements = {
  "old": "new",
  "foo": "bar",
};

That said, I'll check out Tomalak's solution as well. Thanks for posting this question.

那就是说,我也会查看Tomalak的解决方案。感谢您发布此问题。